Full-range analysis of steel tube columns filled with steel-reinforced concrete subjected to compression-flexure loading

Abstract:

In order to study the compression-flexural performance of steel tube filled with steel-reinforced high-strength concrete (STSRHC) members , the compression-flexural behavior of I shape of STSRHC were studied by experimental research and non-linear full-range compute program. The parameters in the study include the ration of axial compression (n=05-085) and different loading direction of steel-reinforce (major axis and minor axis). The results showed that the typical curve of load-deflection have elastic, elastic-plastic and failure three stages. Bearing capacity of composite column decrease with the increase of axial compression ratio, and increase with the moment of inertia nonlinear increase. The peak deflection isn’t different with the axial compression ratio and loading direction. The composite member is up to plane section assumption; The deflection of member is up to sine curve. The non-linear compute program by fiber model goes well with the experimental result, and axial compression ratio, slender ratio and strength of concrete are studied on the full-range of load-deflection.